Head mounted display and method of outputting a content using the same in which the same identical content is displayed

ABSTRACT

The present invention relates to a method of outputting a content using a head mounted display (HMD), and more particularly, to a method of outputting a currently displayed content of a digital device to an HMD. The present invention includes performing a pairing with a digital device having at least one display unit configured to display the content, detecting a location state of the paired digital device, and outputting the content displayed on the digital device to the HMD, wherein the location state comprises a first state in which a display unit of the digital device is located within a preset view angle region of the HMD and a second state in which the display unit of the digital device is not located within the view angle region.

This application claims the benefit of the Korean Patent Application No.10-2012-0077352, filed on Jul. 16, 2012, which is hereby incorporated byreference as if fully set forth herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method of outputting a content usinga head mounted display (HMD), and more particularly, to a method ofoutputting a currently displayed content of a digital device to an HMD.

2. Discussion of the Related Art

A head mounted display (hereinafter abbreviated HMD) means a sort of animage display device wearable on a head like glasses to enable an imageto be viewed. As a digital device tends to have its lightness in weightand its compactness, various kinds of wearable computers are beingdeveloped and the HMD is being widely used. The HMD is combined withsuch a technology as an augmented reality technology, an N-screentechnology and the like over a simple display function, therebyproviding a user with a variety of convenience.

The HMD is usable by being linked with various kinds of digital devices.The HMD is linked with a digital device via network to output a contentof the corresponding digital device. And, the HMD receives a user inputfor the digital device or is able to perform a job interoperable withthe corresponding digital device.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a head mounted displayand method of outputting a content using the same that substantiallyobviate one or more of the problems due to limitations and disadvantagesof the related art.

An object of the present invention is to provide a head mounted displayand method of outputting a content using the same, by which a user canbe provided with an optimal-state content displayed on a display deviceinteroperating with a head mounted display (HMD).

In particular, one object of the present invention is to provide amethod of displaying a content appropriately in accordance with a usestatus of a user wearing a head mounted display (HMD), e.g., eyes of theHMD wearing user.

Another object of the present invention is to provide a head mounteddisplay and method of outputting a content using the same, by which auser can be provided with convenience in a manner that a content outputswitching between a head mounted display (HMD) and a digital deviceinteroperating with the head mounted display is automatically performedwithout a manual input performed by the user.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention. Theobjectives and other advantages of the invention will be realized andattained by the structure particularly pointed out in the writtendescription and claims thereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, a method ofoutputting a content using an HMD (head mounted display) according toone embodiment of the present invention may include the steps ofperforming a pairing with a digital device having at least one displayunit configured to display the content, detecting a location state ofthe paired digital device, and outputting the content currentlydisplayed on the digital device to the HMD, wherein the location stateincludes a first state in which a display unit of the digital device islocated within a preset view angle region of the HMD and a second statein which the display unit of the digital device is not located withinthe view angle region.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, a method of outputting a content usingan HMD (head mounted display) according to another embodiment of thepresent invention may include the steps of detecting at least one markerlocated within a preset view angle region of the HMD, the at least onemarker comprising an identifier indicating content information,detecting a location state of the marker, the location state including afirst state in which the marker is located within the preset view angleregion of the HMD and a second state in which the marker is not locatedwithin the preset view angle region, if the location state of the markeris switched into the second state from the first state, receiving thecontent corresponding to the marker from a server, and outputting thereceived content to the HMD, wherein if the location state of the markeris switched into the first state from the second state, the outputtingstep includes the step of terminating an output of the content.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, an HMD (head mounted display)according to another embodiment of the present invention may include aprocessor controlling an operation of the HMD, a display unit outputtingan image based on a command given by the processor, and a communicationunit transceiving data with at least one digital device based on thecommand given by the processor, wherein the processor performs a pairingwith a digital device having at least one display unit configured todisplay the content, wherein the processor detects a location state ofthe paired digital device, wherein the processor outputs the contentcurrently displayed on the digital device to the display unit of the HMDbased on the detected location state, and wherein the location stateincludes a first state in which the display unit of the digital deviceis located within a preset view angle region of the HMD and a secondstate in which the display unit of the digital device is not locatedwithin the view angle region.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, an HMD (head mounted display)according to a further embodiment of the present invention may include aprocessor controlling an operation of the HMD, a display unit outputtingan image based on a command given by the processor, and a communicationunit transceiving data with at least one digital device based on thecommand given by the processor, wherein the processor detects at leastone marker located within a preset view angle region of the HMD, whereinthe at least one marker includes an identifier indicating contentinformation, wherein the processor detects a location state of themarker, wherein the location state includes a first state in which themarker is located within the preset view angle region of the HMD and asecond state in which the marker is not located within the preset viewangle region, wherein if the location state of the marker is switchedinto the second state from the first state, the processor receives thecontent corresponding to the marker from a server, wherein the processoroutputs the received content to the HMD, and wherein if the locationstate of the marker is switched into the first state from the secondstate, the processor terminates an output of the content.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

Accordingly, the present invention provides the following effects oradvantages.

First of all, the present invention enables a content, which isdisplayed on a display device currently interoperating with an HMD, tomove seamlessly into the HMD in accordance with a use environment of auser, thereby providing the user with convenience.

In particular, if eyes of a user, who wears an HMD, do not face adigital device interoperating with the HMD, a content currentlydisplayed on the corresponding digital device is automatically displayedon the HMD, whereby the user can be provided with the content on theHMD.

Secondly, if eyes of a user, who wears an HMD, face a digital deviceinteroperating with the HMD, the HMD does not perform a content display,whereby the user can be exactly provided with the content of the digitaldevice without interference via a display of the HMD.

Thirdly, according to the present invention, since a triggering fordetermining whether a content currently displayed on a digital devicewill be outputted to an HMD is automatically switched based on eyes of auser, the user can be persistently provided with the content of thedigital device without performing a separate user input.

Finally, according to another embodiment of the present invention, whenuser's eyes through an HMD face another external device having a displayunit, the corresponding external device is enabled to output a content,whereby the user can be provided with the content through variousresources capable of displaying contents.

Effects obtainable from the present invention may be non-limited by theabove mentioned effect. And, other unmentioned effects can be clearlyunderstood from the following description by those having ordinary skillin the technical field to which the present invention pertains.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 is a diagram of an HMD according to an embodiment to the presentinvention, a user wearing the HMD, and a digital device interoperatingwith the HMD;

FIG. 2 is a block diagram of an HMD according to an embodiment of thepresent invention;

FIG. 3 is a flowchart for a content outputting method using an HMDaccording to one embodiment of the present invention;

FIG. 4 is a flowchart for a content outputting method using an HMDaccording to another embodiment of the present invention;

FIGS. 5 to 7 are diagrams for one detailed examples of outputting acontent using an HMD of the present invention;

FIGS. 8 to 10 are diagrams for another detailed examples of outputting acontent using an HMD of the present invention;

FIG. 11 is a flowchart for a content outputting method using an HMDaccording to a further embodiment of the present invention; and

FIG. 12 and FIG. 13 are diagrams for further detailed examples ofoutputting a content using an HMD of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts.

First of all, although terminologies used in the present specificationare selected from general terminologies used currently and widely inconsideration of functions in the present invention, they may be changedin accordance with intentions of technicians engaged in thecorresponding fields, customs, advents of new technologies and the like.Occasionally, some terminologies may be arbitrarily selected by theapplicant(s). In this case, the meanings of the arbitrarily selectedterminologies shall be described in the corresponding part of thedetailed description of the invention. Therefore, terminologies used inthe present specification need to be construed based on the substantialmeanings of the corresponding terminologies and the overall mattersdisclosed in the present specification rather than construed as simplenames of the terminologies.

FIG. 1 shows an HMD 100 according to an embodiment to the presentinvention, a user 10 wearing the HMD, and a digital device 200interoperating with the HMD 100.

Referring to FIG. 1, the digital device 200 may be able to outputvarious kinds of contents 1. For instance, the digital device 200 may beable to output various kinds of multimedia contents including a livebroadcast, a movie, a music, a drama, a webpage, a game, and applicationand the like. The digital device 200 includes at least one display unit220. The content 1 outputted from the digital device 200 may bedisplayed on the display unit 220. Meanwhile, the digital device 200 mayinclude a communication unit (not shown in the drawing). And, data canbe transceived between the HMD 100 and other external devices via thecommunication unit. According to the present invention, the digitaldevice 200 may include various kinds of electronic devices each of whichincludes a display unit and a communication unit. For instance, thedigital device 200 may include such a device, which is capable of imagedisplay and data communication, as a PC, a PDA (personal digitalassistant), a notebook computer, a tablet PC, a television and the like.

The HMD 100 may be configured to work by interoperating with the digitaldevice 200. For the interoperation between the HMD 100 and the digitaldevice 200, a separate pairing or communication connection may beperformed. This paring or communication connecting job may be performedin response to a user input performed on the HMD 100 or the digitaldevice 200. For instance, the HMD 100 may be able to provide a separatebutton or user interface for the pairing or communication connectionwith the digital device 200. Hence, a user may be able to attempt theparing or communication connection between the HMD 100 and the digitaldevice 200 via a user input using the button or user interface.

The HMD 100 is capable of image display using the included display unit.For instance, the HMD 100 may be able to display a user interface of itsown, a response to a user input and the like. And, the HMD 100 may beable to display various kinds of contents by interoperating with thedigital device 200 connected by a network 300. According to theembodiment of the present invention, the HMD 100 may be able to have aview angle region 102 in a preset range. This view angle region 102 is apreset region corresponding to a view of the user wearing the HMD 100and may include a section covering a predetermined angle range in frontdirection of the HMD 100.

According to the embodiment of the present invention, the HMD 100 may beable to detect whether the digital device 200 interoperating with theHMD 100 is located in the view angle region 102 of the HMD 100. Inparticular, the HMD 100 may be able to detect a location state of theinteroperating digital device 200. In the present invention, thelocation state may include a first state having the display unit 220 ofthe digital device 200 located in the view angle region 102 of the HMD100 and a second state having the display unit 220 of the digital device200 located outside the view angle region 102 of the HMD 100.

Meanwhile, the network 300 of the present invention may includewire/wireless networks that enable communications between the HMD 100and the digital device 200. In particular, available wireless networksmay include NFC (near field communication), Zigbee, Infraredcommunication, Bluetooth, Wi-Fi and the like, by which the presentinvention may be non-limited. According to the present invention,communications between the HMD 100 and the digital device 200 may beperformed using one of the above-enumerated networks 300 or acombination thereof.

FIG. 2 is a block diagram of an HMD according to an embodiment of thepresent invention.

Referring to FIG. 2, an HMD 100 according to the present invention mayinclude a processor 110, a display unit 120, an audio output unit 130, acommunication unit 140, a sensor unit 150, a storage unit 160 and apower unit 180.

First of all, the display unit 120 outputs an image to a display screen.In particular, the display unit 120 may be able to output an image basedon a content executed in the processor 110 or a control command given bythe processor 110. According to an embodiment of the present invention,the display unit 120 may be able to display an image based on a controlcommand given by an external device (e.g., a digital device)interoperating with the HMD 100. For instance, the display unit 120 maybe able to display a content currently executed by the digital deviceinteroperating with the HMD 100. In doing so, the HMD 100 receives datafrom the digital device via the communication unit 140 and may be thenable to output a corresponding image based on the received data.

The audio output unit 130 may include such an audio output means as aspeaker, an earphone and the like. The audio output unit 130 may be ableto output audio based on a content executed in the processor 110 or acontrol command given by the processor 110 as well. According to theembodiment of the present invention, the audio output unit 130 may beable to output audio based on a control command given by the digitaldevice interoperating with the HMD 100. For instance, the audio outputunit 130 may be able to output audio based on a content currentlyexecuted by the digital device interoperating with the HMD 100.According to the present invention, the audio output unit 130 may beoptionally provided to the HMD 100.

The communication unit 140 may be able to transmit and receive data byperforming communications with an external device by various protocols.The communication unit 140 accesses a network by wire/wireless and maybe then able to transmit and receive digital data such as contents andthe like. According to the present invention, the HMD 100 may be able toperform a pairing and communication connection with a digital deviceusing the communication unit 140 and may be then able to transceive datawith the connected digital device. Meanwhile, according to oneembodiment of the present invention, the communication unit 140 may beable to include a plurality of antennas. Using a plurality of theantennas, the HMD 100 may be able to detect a location state of adigital device communication-connected with the HMD 100. In particular,using time differences, phase differences and the like of the signalstransceived via a plurality of the antennas provided to the HMD 100, theHMD 100 may be able to detect whether a display unit of the digitaldevice connected with the HMD 100 is located in a view angle region ofthe HMD 100.

The sensor unit 150 may be able to forward a user input or anenvironment recognized by the HMD 100 to the processor 110 using aplurality of sensors installed in the HMD 100. In this case, the sensorunit 150 may be able to include a plurality of sensing means. Forexample, a plurality of the sensing means may include a gravity sensor,a geomagnetic sensor, a motion sensor, a gyro sensor, an accelerationsensor, an infrared sensor, an inclination sensor, a brightness sensor,an altitude sensor, an olfactory sensor, a temperature sensor, a depthsensor, a pressure sensor, a bending sensor, an audio sensor, a videosensor, a GPS (global positioning system) sensor, a touch sensor and thelike. The sensor unit 150 is a common name of one of the various sensingmeans mentioned in the above description. The sensor unit 150 sensesvalorous inputs and user's environment and may be then able to forward asensing result to the processor 100 to perform a corresponding action oroperation. The above-mentioned sensors may be included as separateelements in the HMD 100 or may be included in a manner of beingintegrated into at least one element.

According to another embodiment of the present invention, the sensorunit 150 may include an image photographing sensor (not shown in thedrawing). The image photographing sensor detects an image within apreset view angle image and may be then able to provide the detectedimage to the processor 110. According to one embodiment of the presentinvention, based on the image detected via the image photographingsensor, the processor 110 may be able to detect whether a digital device(or, a display unit of the corresponding digital device) interoperatingwith the HMD 100 is present within the view angle region of the HMD 100.In this case, the image photographing sensor may be substituted with aninfrared sensor or the like for the purpose of the present invention.

The storage unit 160 of the present invention may be able to storevarious digital data including video, audio, photos, moving pictures,applications and the like. The storage unit 160 may include such adigital data storage space as a flash memory, a random access memory(RAM), a solid state drive (SSD) and the like. According to anembodiment of the present invention, the storage unit 160 may be able totemporarily store data received from a digital device via thecommunication unit 140. In doing so, the storage unit 160 may be usedfor the buffering to output the data or content received from thedigital device to the HMD 100. According to the present invention, thestorage unit 160 may be optionally provided to the HMD 100.

The power unit 170 is the power source connected to a battery in adevice or an external power source and may be able to supply power tothe HMD 100.

The processor 110 of the present invention may be able to execute thecontents received via data communications, the contents saved in thestorage unit 160 and the like. Moreover, the processor 110 may be ableto activate various applications and to process the data inside thedevice. In addition, the processor (or, main control unit) 110 may beable to control various units of the HMD 100 mentioned in the abovedescription and data transmissions and receptions between the units.

In the block diagram of the HMD 100 shown in FIG. 2 the separatelyillustrated blocks indicate elements of the device logically anddiscriminatively. Therefore, the elements of the device mentioned in theabove description may be installed in a manner of being integrated intoone chip or a plurality of chips by the design of the device.

FIG. 3 is a flowchart for a content outputting method using an HMDaccording to one embodiment of the present invention. In the followingdescription, the steps shown in FIG. 3 may be controlled by theprocessor 110 of the HMD 100 shown in FIG. 2.

Referring to FIG. 3, an HMD of the present invention may be able toperform a communication connection with a digital device [S310]. In thiscase, the communication connection may be performed in repose to a userinput performed on the HMD or the digital device. For instance, the HMDmay be able to provide a separate button or user interface for thecommunication connection with the digital device. In dong so, a user maybe able to perform the communication connection between the HMD and thedigital device by performing a user input using the button or the userinterface. Before the communication connection between the HMD and thedigital device is performed, the HMD may be paired with the digitaldevice. If the HMD of the present invention performs the communicationconnection with the digital device, the HMD may be able to transceivedata with the digital device while a session is open.

Subsequently, the HMD of the present invention may be able to detect alocation state of the connected digital device [S320]. According to thepresent invention, the location state may include a first state havingthe display unit of the digital device located in a preset view angleregion of the HMD and a second state having the display unit of thedigital device located outside the view angle region of the HMD.According to the present invention, the view angle region is a presetregion corresponding to eyes of a user who is wearing the HMD and mayinclude a section within a predetermined angle range in front directionof the HMD.

According to one embodiment of the present invention, the HMD may beable to detect a location state of a digital device using a plurality ofantennas. In particular, the HMD may be able to perform transceive datawith the digital device via a plurality of the antennas provided to theHMD. In dong so, using time differences, phase differences and the likeof signals transceived via a plurality of the antennas, it may be ableto detect relative locations and directions between the HMD and thedigital device connected with the HMD. According to the presentinvention, even if a direction (e.g., an azimuth angle) having thedigital device located therein is changing while a distance between thedigital device is maintained constant, it may be able to accuratelydetect a location state of the digital device using a plurality of theantennas provided to the HMD.

According to another embodiment of the present invention, it may be ableto detect a location state of the digital device using an imagephotographing sensor. In particular, while the HMD establishes acommunication connection with the digital device, the imagephotographing sensor detects an image within the preset view angleregion of the HMD and may be then able to provide the detected image tothe processor of the HMD. Based on the image detected by the imagephotographing sensor, the processor may be able to detect whether adigital device (or, a display unit of the corresponding digital device)connected with the HMD is present within the view angle region of theHMD. For instance, the digital device connected with the HMD may be ableto output a preset light pattern and the HMD is then able to detect thelight pattern outputted from the digital device. In dong so, the lightpattern may include at least one of a temporal pattern and a spatialpattern. Moreover, according to the embodiment of the present invention,the light pattern may be outputted from the display unit of the digitaldevice.

If the digital device connected with the HMD is present within the viewangle region of the HMD, the HMD may be able to detect the light patternoutputted from the digital device via the image photographing sensor.Otherwise, i.e., if the digital device connected with the HMD is notpresent within the view angle region of the HMD, the light patternoutputted from the digital device may not be detected via the imagephotographing sensor. Meanwhile, when a light pattern is outputted viathe display unit of the digital device according to the embodiment ofthe present invention, even if the display unit of the correspondingdigital device does not face a user despite that the digital device ispresent within the view angle region, the light pattern may not bedetected. In particular, when a user is in a situation that the displayunit of the digital device is not viewable, the HMD may be unable todetect the light pattern. Therefore, based on whether a light pattern ofa digital device is detected within a view angle region, an HMD of thepresent invention may be able to detect a location state of the digitaldevice.

When the digital device performs the communication connection with theHMD according to the embodiment of the present invention, the lightpattern may be outputted via the display unit of the digital device, bywhich the present invention may be non-limited. Alternatively, accordingto the present invention, the digital device may be able to output alight pattern of itself irrespective of whether the digital device hasperformed the communication connection with the HMD.

Subsequently, the HMD of the present invention may be able to output acontent currently displayed on the digital device to the HMD based onthe detected location state of the digital device. To this end, based onthe detected location state of the digital device, the HMDpreferentially determines whether the display unit of the correspondingdigital device is present within the view angle region of the HMD[S330]. If the display unit of the digital device is present within theview angle region, the HMD of the present invention may not output thecurrently displayed content of the digital device [S340]. On thecontrary, if the display unit of the digital device is not presentwithin the view angle region, the HMD of the present invention may beable to output the currently displayed content of the digital device[S342]. To this end, the HMD receives the currently displayed content ofthe digital device from the digital device and may be then able tooutput the received content to the display unit of the HMD.

Thus, according to the embodiment of the present invention, while theHMD is connected with the digital device, the HMD may be able to triggerwhether to output a content of the digital device in accordance with alocation state relative to that of the digital device. In particular, inthe first state in which the display unit of the digital device islocated within the view angle region of the HMD, the HMD does not outputa currently displayed content of the digital device. On the other hand,in the second state in which the display unit of the digital device isnot located within the view angle region of the HMD, the HMD may be ableto output a currently displayed content of the digital device. Hence, inthe second state in which a location of the digital device deviates fromthe view of the user wearing the HMD, the user may be able to beprovided with the content of the digital device via the HMD. On theother hand, in the first state in which a location of the digital devicelies within the view of the user wearing the HMD, the user may be ableto be provided with the content via the digital device withoutinterference via the display of the HMD.

Meanwhile, according to another embodiment of the present invention,after a detected location state of a digital device has been switched,if the switched location state is maintained over a preset time, an HMDmay be able to trigger whether to output a content of the digitaldevice. In particular, if the location state of the digital device isswitched into a second state from a first state in which the content ofthe digital device is not outputted, when the location state of thedigital device is maintained in the second state over the preset time,the HMD may be able to output the content of the digital device.Moreover, if the location state of the digital device is switched intothe first state from the second state in which the content of thedigital device is outputted, when the location state of the digitaldevice is maintained in the first state over a preset time, the HMD maybe able to terminate the output of the content of the digital device.

Subsequently, the HMD of the present invention determines whether thecommunication connection with the digital device is ongoing [S350]. Ifthe communication connection with the digital device is ongoing, the HMDgoes back to the step S320 and then detects a location state of thepaired digital device. If the communication connection between the HMDand the digital device is terminated, the HMD may terminate the contentoutput of the digital device.

In particular, an HMD according to the present invention may be able todetect a real-time location state of a digital device while acommunication connection is established between the HMD and the digitaldevice. Based on the detected location state, it may be able todetermine whether a content currently displayed by the digital devicewill be outputted to the HMD. If the detected location state isswitched, it may be able to adjust whether to output the content of thedigital device to the HMD based on the switched location state. If thecommunication connection with the digital device is terminated, the HMDmay be able to terminate both of the job of detecting the location stateof the digital device and the job of outputting the content of thedigital device.

FIG. 4 is a flowchart for a content outputting method using an HMDaccording to another embodiment of the present invention. According tothe present invention, the processor 110 of the HMD 100 shown in FIG. 2may be able to control the operations of the respective steps mentionedin the following. In the following description of the embodiment withreference to FIG. 4, details of the same or similar parts of the formerembodiment described with reference to FIG. 3 shall be omitted.

Referring to FIG. 4, an HMD of the present invention performs a pairingwith a digital device [S410]. Subsequently, the HMD may be able todetect a location state of the paired digital device [S420]. Thedetailed embodiments of the steps S410 and S420 are identical to thoseof the former steps S310 and S320 described with reference to FIG. 3.Yet, in the embodiment of the step S420, the HMD may be able to detectthe location state of the paired digital device despite that acommunication connection with the digital device is not performed yet.To this end, according to one embodiment of the present invention, theHMD may be able to detect the location state of the correspondingdigital device based on whether a light pattern outputted from thedigital device is detected.

Subsequently, based on the detected location state of the digitaldevice, it may be able to determine whether to establish a communicationconnection between the HMD and the digital device. To this end, the HMDpreferentially determines whether the display unit of the correspondingdigital device is present within the view angle region of the HMD basedon the detected location state of the digital device [S430]. If thedisplay unit of the digital device is present within the view angleregion, the HMD of the present invention may not establish thecommunication connection with the digital device [S440]. On thecontrary, if the display unit of the digital device is not presentwithin the view angle region, the HMD may be able to establish thecommunication connection with the digital device [S442]. If the HMDestablishes the communication connection with the digital device, it maybe able to receive a currently displayed content of the digital devicefrom the digital device [S444]. The HMD of the present invention may bethen able to output the received content [S446].

Thus, according to the embodiment of the present invention, while theHMD and the digital device are paired with each other, the HMD may beable to trigger whether to establish the communication connection withthe digital device in accordance with a location state relative to thatof the digital device. In particular, in the first state in which thedisplay unit of the digital device is located within the view angleregion of the HMD, the communication connection between the HMD and thedigital device is established. On the other hand, in the second state inwhich the display unit of the digital device is not located within theview angle region of the HMD, the communication connection between theHMD and the digital device is not established. Once the communicationbetween the HMD and the digital device is established, the HMD receivesa currently activated content of the digital device by real time and maybe then able to output the received content.

Meanwhile, according to another embodiment of the present invention,after a detected location state of a digital device has been switched,if the switched location state is maintained over a preset time, it maybe able to trigger whether to establish a communication connectionbetween an HMD and the digital device. In particular, if the locationstate of the digital device is switched into a second state from a firststate in which the communication connection between the HMD and thedigital device is not established, when the location state of thedigital device is maintained in the second state over the preset time,it may be able to establish the communication connection between the HMDand the digital device. Moreover, if the location state of the digitaldevice is switched into the first state from the second state in whichthe communication connection between the HMD and the digital device isestablished, when the location state of the digital device is maintainedin the first state over a preset time, the HMD may be able to terminatethe communication connection between the HMD and the digital device.

Subsequently, the HMD of the present invention determines whether theHMD is being paired with the digital device is ongoing [S450]. If theHMD is being paired with the digital device, the HMD goes back to thestep S420 and then detects a location state of the paired digitaldevice. If the pairing between the HMD and the digital device isterminated, the HMD may terminate the content output of the digitaldevice.

In particular, an HMD according to the present invention may be able todetect a real-time location state of a digital device while paired withthe digital device. Based on the detected location state, it may be ableto determine whether to establish a communication connection between theHMD and the digital device. If the detected location state is switched,it may be able to adjust whether to establish the communicationconnection between the HMD and the digital device based on the switchedlocation state. If the pairing with the digital device is terminated,the HMD may be able to terminate both of the job of detecting thelocation state of the digital device and the job of outputting thecontent of the digital device.

FIGS. 5 to 7 are diagrams for one detailed examples of outputting acontent 1 using an HMD 100 of the present invention. In the embodimentsshown in FIGS. 5 to 7, an HMD 100 is being paired with a digital device200. Referring to FIGS. 5 to 7, it may be able to control an output of acontent 1 of the HMD 100 based on a location state of a digital device200 with reference to the HMD 100, i.e., relative locations anddirections between the HMD 100 and the digital device 200.

First of all, FIG. 5 and FIG. 6 show a case that the location state ofthe digital device 200 is switched into a second state [FIG. 5 (b)] froma first state [FIG. 5 (a)] according to an embodiment of the presentinvention. In doing so, the content 1 currently displayed on the digitaldevice 200 moves to the HMD 100 and may be then displayed on the HMD100.

In particular, referring to FIG. 5 (a), a user 10 is able to watch thecontent 1 displayed on a display unit 220 of the digital device 200while wearing the HMD 100 of the present invention. In doing so, thedisplay unit 220 of the digital device 200 may be located within a viewangle region 102 of the HMD 100. According to an embodiment of thepresent invention, if the display unit 220 of the digital device 200 ispresent within the view angle region 102 of the HMD 100, the HMD 100does not output the content 1. According to one embodiment of thepresent invention, in FIG. 5 (a), the HMD 100 may be in a state that acommunication connection with the digital device 200 is not established.

Meanwhile, referring to FIG. 5 (b), according to an embodiment of thepresent invention, while a user 10 is wearing the HMD 100, the user 10may look at a different spot instead of looking at the display unit 220of the digital device 200. In doing so, the display unit 220 of thedigital device 200 may be located outside the view angle region 102 ofthe HMD 100. Thus, if the display unit 220 of the digital device 200 ispresent outside the digital device 200, the HMD 100 may be able tooutput the content 1. According to one embodiment of the presentinvention, in FIG. 5 (b), the HMD 100 has already established thecommunication connection with the digital device 200. Hence, the HMD 100receives the content 1 from the digital device 200 via a network 300 byreal time and may be then able to output the received content 1.Meanwhile, according to the embodiment of the present invention, thedigital device 200 may stop displaying the content 1 in the second statein which the digital device 200 is located outside the view angle region102 of the HMD 100.

According to the embodiment of the present invention, when the locationstate of the digital device 200 is switched from the first state, inwhich the location state is located within the view angle region 102 ofthe HMDD, into the second state in which the location state is locatedoutside the view angle region 102 of the HMD 100, an appropriatefeedback may be provided on the HMD 100. For instance, if the locationstate of the digital device 200 is switched into the second state fromthe first state, the HMD 100 may be able to provide a vibrationfeedback. For another instance, if the location state of the digitaldevice 200 is switched into the second state from the first state, theHMD 100 may be able to output the content 1 by fade-in. For anotherinstance, the HMD 100 may be able to output the content 1 after a presettime. In particular, the HMD 100 may be able to output the content 1after duration of the preset time from a time in which the locationstate of the digital device 200 was switched. Moreover, the digitaldevice 200 may be able to stop an output of the content 1 during thepreset time from the time in which the location state of the digitaldevice 200 was switched. After duration of the preset time, the digitaldevice 200 may continue to output the content 1. For instance, if thecontent 1 is a video content and the location state of the digitaldevice 200 is switched from the first state into the second state, thedigital device 200 may be able to pause the output of the video contentduring a preset time.

Meanwhile, according to another embodiment of the present inventionshown in FIG. 6, when the location state of the digital device 200 isswitched from the first state to the second state, the HMD 100 may beable to output the content 1 in a manner that the content 1 slides tomove. In doing so, the HMD 100 enables the content 1 to slide to moveinto a center region from a side in which the display unit 220 of thedisplay device 200 deviating from the view angle region 102 is located.For instance, if the digital device 200 in the first state deviates fromthe view angle region 102 of the HMD 100 and then enters the secondstate [FIG. 6 (a)], the HMD 100 enables the content 1 to be displayed ina manner that the content 1 slides to move to a center region from aleft side in which the digital device 200 deviating from the view angleregion 102 is located [FIG. 6 (b)]. In this case, the center region isthe region situated at a central part of a frame displayed by thedisplay unit and may include a preset region situated at a central partof the view angle region 102.

FIG. 7 shows that a location state of a digital device 200 is switchedto a first state [FIG. 7 (b)] from a second state [FIG. 7 (a)] accordingto an embodiment of the present invention. In this case, an HMD 100 maybe able to terminate an output of a currently displayed content 1.According to another embodiment of the present invention, if the digitaldevice 200 pauses a display of the contents 1 in the second state, thedigital device 200 may be able to resume the paused display of thecontent 1 in the first state. Therefore, the content 1 displayed on theHMD 100 may be displayed by moving into the digital device 200.

In particular, according to an embodiment of the present invention,referring to FIG. 7 (a), a user 10 may look at a different spot insteadof looking at a display unit 220 of a digital device 200 while wearingan HMD 100. Thus, if the display unit 220 of the digital device 200 islocated outside the view angle region 102 of the HMD 100, the HMD 100may be able to output a content 1. According to one embodiment of thepresent invention, in FIG. 7 (a), the HMD 100 may have established acommunication connection with the digital device 200. Hence, the HMD 100receives the content 1 from the digital device 200 by real time via anetwork 300 and may be then able to output the received content 1.Meanwhile, according to an embodiment of the present invention, thedigital device 200 may pause a display of the content 1 in a secondstate in which the digital device 200 is located outside the view angleregion 102 of the HMD 100.

Referring to FIG. 7 (b), the user 10 may look at the display unit 220 ofthe digital device 200 while wearing the HMD 100. In doing so, thedisplay unit 220 of the digital device 200 may be located within theview angle region 102 of the HMD 100. According to an embodiment of thepresent invention, if the display unit 220 of the digital device 200 islocated within the view angle region 102 of the HMD 100, the HMD 100 maynot output the content 1. According to one embodiment of the presentinvention, in FIG. 7 (b), the HMD 100 may not have established acommunication connection with the digital device 200. Meanwhile,according to an embodiment of the present invention, if the digitaldevice 200 pauses a display of the content 1, the digital device 200 mayresume the display of the content 1.

FIG. 8 shows that a location state of a digital device 200 is switchedto a first state [FIG. 8 (b)] from a second state [FIG. 8 (a)] accordingto another embodiment of the present invention. According to theembodiment shown in FIG. 8, the digital device 200 may be able todisplay a content 1 in both of the first state and the second state.

According to one embodiment of the present invention, an HMD 100 may beable to adjust whether to output the content 1 based on whether thedigital device 200 located within the view angle region 102 of the HMD100 displays the same content 1 of the HMD 100.

Referring to FIG. 8 (a), a user 10 may look at a different spot insteadof looking at a display unit 220 of a digital device 200 while wearingan HMD 100. Thus, if the display unit 220 of the digital device 200 islocated outside the view angle region 102 of the HMD 100, the HMD 100may be able to output a content 1. According to the embodiment shown inFIG. 8, the display device 200 is displaying the content 1 in a secondstate in which the digital device 200 is located outside the view angleregion 102 of the HMD 100.

In this case, referring to FIG. 8 (b), the user 10 may look at thedisplay unit 220 of the digital device 200 while wearing the HMD 100. Indoing so, the digital device 200 having entered the view angle region102 of the HMD 100 is displaying the content 1. The content 1 currentlydisplayed by the digital device 200 may be identical to or differentfrom the content 1 currently outputted by the HMD 100. In particular, ifdata are transmitted and received between the digital device 200 and theHMD 100 by real time, the content 1 currently displayed by the digitaldevice 200 may be identical to the content 1 currently outputted by theHMD 100. On the contrary, if data are not transmitted and receivedbetween the digital device 200 and the HMD 100 by real time, the content1 currently displayed by the digital device 200 may not be identical tothe content 1 currently outputted by the HMD 100. For instance, in casethat the content 1 is a webpage, a webpage change in response to a URLaccess change of the digital device 200 may not be delivered to the HMD100 yet.

Hence, the HMD 100 according to an embodiment of the present inventiondetermines whether the content 1 displayed by the digital device havingentered the view angle region 102 is identical to the content 1currently outputted by the HMD 100. If the content 1 displayed by thedigital device is identical to the content 1 currently outputted by theHMD 100, referring to FIG. 8 (b), the HMD 100 may be able to avoid theoverlapping of the display of the content 1 by terminating the output ofthe content 1. Otherwise, i.e., if the content 1 displayed by thedigital device is not identical to the content 1 currently outputted bythe HMD 100, the HMD 100 may not terminate the output of the content 1.

Meanwhile, according to the embodiment of the present invention, whenthe location state of the digital device 200 is switched into a firststate, in which the location state is located within the view angleregion 102 of the HMDD, into a second state in which the location stateis located outside the view angle region 102 of the HMD 100, anappropriate feedback may be provided on the HMD 100. For instance, ifthe location state of the digital device 200 is switched into the firststate from the second state, the HMD 100 may be able to provide avibration feedback. For another instance, if the location state of thedigital device 200 is switched into the first state from the secondstate, the HMD 100 may be able to fade out the content 1.

FIG. 9 shows another embodiment of outputting a content 1 using an HMD100 of the present invention. According to an embodiment of the presentinvention, a location state of a digital device 200 is determined basedon a location of the digital device 200 and a direction of a displayunit 220 of the digital device 200. In particular, the location statemay be determined based on whether the display unit 220 of the digitaldevice 200 is located within a view angle region 102 of an HMD 100.According to one embodiment of the present invention, it may be able todetect the location state of the According to one embodiment of thepresent invention, based on whether a light pattern 5 outputted by thedigital device 200 is detected.

Referring to FIG. 9 (a), while the digital device 200 is located withinthe view angle region 102 of the HMD 100, the display unit 220 of thedigital device 200 may be enabled to face the HMD 100. In doing so, theHMD 100 may be able to detect the light pattern 5 outputted by thedigital device 200. If the light pattern 5 is detected, the HMD 100recognizes a location state of the digital device 200 as a first stateand does not output the content 1 of the digital device 200correspondingly.

Meanwhile, referring to FIG. 9 (b), the digital device shown in FIG. 9(a) may be inverted. In particular, despite that the digital device 200is located within the view angle region 102 of the HMD 100, the displayunit 220 of the digital device 200 may be set not to face the HMD 100.In dong so, the HMD 100 may not be able to detect the light pattern 5outputted by the digital device 200. According to an embodiment of thepresent invention, the HMD 100 may recognize the location state of thedigital device 200 shown in FIG. 9 (b), in which the light pattern 5 isnot detected, as a second state. Hence, the HMD 100 may be able tooutput the content 1 of the digital device 200.

FIG. 10 shows a further embodiment of outputting a content 1 using anHMD 100 of the present invention. According to an embodiment of thepresent invention, in a second state in which a display unit 220 of adigital device 200 is not located within a view angle region 102 of anHMD 100, it may be able to detect whether a display unit 222 of at leastone external device 202 is present in the view angle region 102. If itis detected that detect the display unit 222 of the at least oneexternal device 202 is present in the view angle region 102, the displayunit 222 of the corresponding external device 202 may be able to outputa content 1 of the digital device 200.

For instance, referring to FIG. 10 (a), the display unit 220 of thedigital device 200 may be located outside the view angle region 102 ofthe HMD 100. In this case, the HMD 100 may be able to output the contentof the digital device 200, of which details are mentioned in theforegoing description with reference to FIG. 7 (a).

Meanwhile, in the second state in which display unit 220 of the digitaldevice 200 is located outside the view angle region 102 of the HMD 100,referring to FIG. 10 (b), the external device 202 may be located withinthe view angle region 102 of the HMD 100. In particular, the HMD 100 maybe able to detect the display unit 222 of the external device 202located within the view angle region 102. Thus, if the display unit 222of the external device 202 is detected within the view angle region 102,the content 1 may be outputted to the display unit 222 of thecorresponding external device 202. To this end, the detected externaldevice 202 may be able to establish a communication connection with thedigital device 200. Once the communication connection is establishedbetween the external device 202 and the digital device 200, the externaldevice 202 may be able to receive the content 1 from the digital device200 using the network 300. And, the received content 1 may be outputtedto the display unit 222 of the external device 202.

FIGS. 11 to 13 show further embodiments of the present invention.

In particular, FIG. 11 is a flowchart for a content outputting methodusing an HMD according to a further embodiment of the present invention.According to the present invention, the processor 110 of the HMD 100shown in FIG. 2 may be able to control the following operations of therespective steps shown in FIG. 1. Details of the same or similar partsin the former embodiment described with reference to FIG. 3 shall beomitted in the description of the present embodiment with reference toFIG. 11.

Referring to FIG. 11, an HMD of the present invention detects a firstmarker located within a view angle region of the HMD [S1110]. Inparticular, a marker of the present invention is the identifierindicating content information and may include one of a bar code, a QRcode, an RFID, a color code, an image code and the like.

Subsequently, the HMD may be able to detect a location state of thefirst marker [S1120]. The location state of the present invention mayinclude a first sate having the first marker located within a presetview angle region of the HMD and a second state having the first markernot located within the view angle region. According to an embodiment ofthe present invention, the HMD may be able to detect the location stateof the first marker using an image photographing sensor. In particular,the image photographing sensor detects an image within the preset viewangle region and may then provide the detected image to a processor ofthe HMD. The processor may be able to detect whether the first marker ispresent within the view angle region of the HMD based on the imagedetected by the image photographing sensor.

Subsequently, based on the detected location state of the first marker,the HMD may be able to determine whether to output a contentcorresponding to the first marker. To this end, based on the detectedlocation state of the first marker, the HMD determines whether the firstmarker is located within the view angle region of the HMD [S1130]. Ifthe first marker is located within the view angle region of the HMD, theHMD does not output the content corresponding to the first marker[S1140]. Otherwise, i.e., if the first marker is not located within theview angle region of the HMD, the HMD may be able to receive the contentcorresponding to the first marker [S1142]. In dong so, the HMD may beable to receive the content from a server via the network. Once thecontent is received from the server, the HMD outputs the receivedcontent [S1144].

Subsequently, the HMD keeps determining whether a marker within the viewangle region is detected. In dong so, the HMD may be able to determinewhether a second marker different from the first marker is detectedwithin the view angle region [S1150]. If the second marker is notdetected, the HMD goes back to the step S1120 and then continues thecontent output operation in accordance with the location state of thefirst marker. In particular, based on the location state of the firstmarker, the HMD may be able to trigger whether to output the contentcorresponding to the first marker. If the second marker is detected, theHMD terminates the content output operation in accordance with thelocation state of the first marker. In doing so, the HMD may be able todetect the location state of the newly detected second marker and may bethen able to perform a content output in accordance with the locationstate of the second marker by the same method mentioned in the foregoingdescription of the embodiment with reference to FIG. 11.

FIG. 12 and FIG. 13 show a detailed method of outputting a content usingan HMD in accordance with the former embodiment shown in FIG. 11.

Referring to FIG. 12, a user 10 may be able to watch a content 1including a marker 5 while wearing an HMD 100. In this case, the content1 may include an analog content instead of a digital content. And, thecontent 1 may include a partial or whole region of a book, a magazine, anewspaper, a photo or the like. The content 1 may include the marker 5indicating the information on the corresponding content 1. According toan embodiment of the present invention, the marker is located within aview angle region 102 of the HMD 100. And, the HMD 100 does not outputthe content 1.

Referring to FIG. 13 (a), according to an embodiment of the presentinvention, the user 10 may look at a different spot other than thecontent 1 while wearing the HMD 100. In doing so, the marker 5 includedin the content 1 may be located outside the view angle region 102 of theHMD 100. In particular, a location state of the marker 5 may be switchedfrom a first state [FIG. 12] to a second state [FIG. 13 (a)]. Thus, ifthe marker is located outside the view angle region 102 of the HMD 100,the HMD 100 may be able to output the content 1 corresponding to themarker 5. In particular, the HMD 100 receives the content 1corresponding to the marker 5 from a server (not shown in the drawing)via a network 300 and may be then able to output the received content.

Meanwhile, referring to FIG. 13 (b), the user 10 may be able to look atthe content 1 again while wearing the HMD 100. In dong so, the marker 5included in the content 1 may be located within the view angle region ofthe HMD 100. In particular, the location state of the marker 5 may beswitched from the second state [FIG. 13 (a)] to the first state [FIG. 13(b)]. Thus, if the marker 5 reenters the view angle region 102 of theHMD 100, the HMD 100 may be able to terminate the output of the content1 corresponding to the marker 5.

Meanwhile, according to one embodiment of the present invention, the HDM100 may be able to adjust whether to output the content 1 based onwhether the content 1 located with the view angle region 102 of the HMD100 is identical to the content 1 currently outputted by the HMD 100. Inparticular, the HMD 100 determines whether the content 1 having enteredthe view angle region 102 is identical to the content 1 currentlyoutputted by the HMD 100. If the content 1 having entered the view angleregion n102 is identical to the content 1 currently outputted by the HMD100, referring to FIG. 13 (b), the HMD 100 may be able to avoid theoverlapping of the display of the content 1 by terminating the output ofthe content 1. Otherwise, i.e., if the content 1 having entered the viewangle region 102 is not identical to the content 1 currently outputtedby the HMD 100, the HMD 100 may not terminate the output of the content1.

According to the present invention, a location state of a digital devicemay be determined based on eyes of a user who wears an HMD. The HMD ofthe present invention may further include an image photographing sensorconfigured to detect a position of the pupil of the user wearing the HMDand may be able to track eyes of the corresponding user using the imagephotographing sensor. Therefore, the location state of the digitaldevice of the present invention may be determined based on whether adisplay unit of the digital device is located within a view angle regionof the user wearing the HMD. In this case, the view angle region mayinclude a region within a predetermined range corresponding to the eyesof the user wearing the HMD. In particular, according to the presentinvention, the location state of the digital device may include a thirdstate in which the display unit of the digital device is located withinthe view angle region of the user wearing the HMD and a fourth state inwhich the display unit of the digital device is not located within theview angle region of the user wearing the HMD. Meanwhile, according toan embodiment of the present invention, a location state of a marker maybe also determined based on the eyes of the user wearing the HMD in themanner mentioned in the above description.

HMD mentioned in the description of the present invention may bechangeable with or replaceable by various devices for the purposes ofthe present invention. For instance, HMD of the present invention mayinclude such a device, which is capable of providing a display by beingput on a user, as EMD (eye mounted display), eyeglass, eyepiece,eyewear, HWD (head worn display) and the like. And, the HMD may benon-limited by the terminologies used for the description of the presentinvention.

As mentioned in the foregoing description, all the related matters aredescribed in BEST MODE for embodiments of the present invention.

As mentioned in the foregoing description, the present invention may beapplicable to electronic devices entirely or in part.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the inventions. Thus, itis intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A method of outputting a content using an HMD(head mounted display), the method comprising: performing a pairing witha digital device having at least one display unit configured to displaya first content; detecting a location state of the paired digitaldevice, wherein the location state comprises a first state in which adisplay unit of the digital device is located within a preset view angleregion of the HMD and a second state in which the display unit of thedigital device is not located within the preset view angle region of theHMD; when the location state is changed from the first state to thesecond state, receiving the first content which is displayed by thedigital device and outputting the first content that is on the HMD; andwhen the location state is changed from the second state to the firststate, determining whether a second content currently being displayed onthe digital device is identical to the first content currently beingoutput on the HMD, and terminating the output of the first content onthe HMD when the second content is identical to the first content orcontinuing the output of the first content on the HMD when the secondcontent is not identical to the first content, wherein the first contentoutput on the HMD is the same identical first content displayed on thedigital device without changing a spatial dimension and withoutaugmenting a reality of the first content displayed on the digitaldevice.
 2. The method of claim 1, wherein the receiving step furthercomprises: establishing a communication connection with the digitaldevice; and receiving the first content currently displayed on thecommunication connected digital device when the location state ischanged from the first state to the second state.
 3. The method of claim1, wherein the outputting step further comprises determining whether tooutput the content to the HMD if the detected location state is switchedand the switched location state continues over a preset time.
 4. Themethod of claim 1, further comprising: if the detected location state isswitched between the first state and the second state, providing avibration feedback on the HMD.
 5. The method of claim 1, wherein theoutputting step further comprises fading in the first content if thedetected location state is switched from the first state to the secondstate.
 6. The method of claim 1, wherein the outputting step furthercomprises fading out the first content if the detected location state isswitched from the second state to the first state.
 7. The method ofclaim 1, wherein the outputting step further comprises when the detectedlocation state is switched from the first state to the second state,outputting the first content in a manner that the first content slidesto move into a center region from a side in which the display unit ofthe digital device deviating from the location of the view angle region.8. The method of claim 1, wherein if the first content comprises a videocontent and the detected location state is switched from the first stateto the second state, an output of the video content of the digitaldevice is paused for a preset time period.
 9. The method of claim 1,wherein the detecting step further comprises detecting the locationstate using signals transceived with the digital device via a pluralityof antennas included in the HMD.
 10. The method of claim 1, wherein thedetecting step further comprises detecting the location state based onwhether a light pattern output by the paired digital device is detected.11. The method of claim 1, further comprising: if the detected locationstate is the second state, detecting whether a display unit of at leastone external device is present within the view angle region; and if thedisplay unit of the at least one external device is detected within theview angle region, outputting the first content to the display unit ofthe corresponding external device.
 12. The method of claim 1, whereinthe location state comprises a third state in which the display unit ofthe digital device is located within a view angle region of a userwearing the HMD and a fourth state in which the display unit of thedigital device is not located within the view angle region of a userwearing the HMD.
 13. An HMD (head mounted display) comprising: aprocessor configured to control an operation of the HMD; a display unitconfigured to output an image based on a command given by the processor;and a communication unit configured to transceive data with at least onedigital device based on the command given by the processor, wherein theprocessor is further configured to: perform a pairing with a digitaldevice having at least one display unit configured to display a firstcontent, detect a location state of the paired digital device, thelocation state comprising a first state in which the display unit of thedigital device is located within a preset view angle region of the HMDand a second state in which the display unit of the digital device isnot located within the view angle region of the HMD, when the locationstate is changed from the first state to the second state, receive thefirst content which is displayed by the digital device and output thefirst content on the HMD, and when the location state is changed fromthe second state to the first state, determine whether a second contentcurrently being displayed on the display device is identical to thefirst content currently being output on the HMD and terminate the outputof the first content on the HMD when the second content is identical tothe first content or continue the output of the first content on the HMDwhen the second content is not identical to the first content, andwherein the first content output on the HMD is the same identical firstcontent displayed on the digital device without changing a spatialdimension and without augmenting a reality of the first contentdisplayed on the digital device.
 14. The HMD of claim 13, wherein theHMD establishes a communication connection with the digital device, andreceives the first content currently displayed on the communicationconnected digital device when the location state is changed from thefirst state to the second state.
 15. The HMD of claim 13, wherein theprocessor is further configured to determine the location state when thedetected location state is switched and the switched location statecontinues over a preset time.
 16. The HMD of claim 13, wherein if thedetected location state is switched between the first state and thesecond state, a vibration feedback is provided to the HMD.
 17. The HMDof claim 13, wherein if the detected location state is switched from thefirst state to the second state, the first content is faded in.
 18. TheHMD of claim 13, wherein if the detected location state is switched fromthe second state to the first state, the first content is faded out. 19.The HMD of claim 13, wherein when the detected location state isswitched from first state to the second state, the first content isoutput in a manner that the first content slides to move into a centerregion from a side in which the display unit of the digital devicedeviating from the location of the view angle region.
 20. The HMD ofclaim 13, wherein if the first content comprises a video content and thedetected location state is switched from the first state to the secondstate, an output of the video content on the digital device is pausedfor a preset time period.
 21. The HMD of claim 13, wherein thecommunication unit comprises a plurality of antennas and wherein theprocessor detects the location state using signals transceived with thedigital device via a plurality of antennas included in the HMD.
 22. TheHMD of claim 13, wherein the location state is detected based on whethera light pattern output by the paired digital device is detected.
 23. TheHMD of claim 13, wherein if the detected location state is the secondstate, it is detected whether a display unit of at least one externaldevice is present within the view angle region and wherein if thedisplay unit of the at least one external device is detected within theview angle region, the first content is output to the display unit ofthe corresponding external device.
 24. The HMD of claim 13, wherein thelocation state comprises a third state in which the display unit of thedigital device is located within a view angle region of a user wearingthe HMD and a fourth state in which the display unit of the digitaldevice is not located within the view angle region of a user wearing theHMD.